Doxycycline Hyclate and bland diet

I vomited twice while taking it in the morning on an empty stomach...when I took it right after eating I had no nausea. The night I took the last dose I woke up with severe heartburn, I have never had heartburn before. It lasted a whole day with out letting up its been about three days and now it comes and goes. I can hardly eat because it burns every time I swallow anything. does anyone have some suggestions as to some relief of the heart burn and how long it lasts...I just want to get back to normal